They use every metal in aircraft, but most of the metal in an aircraft is aluminum.
Mostly aluminium alloys, but some aircraft have used steel, titanium and more recently, composite materials.
Aluminum is light weight metal. So it helps the aircraft to have more lift. Also it is very strong and durable.
a narrow body aircraft have a single aisle while the wide body aircraft have two aisles.
The body of an aircraft or plane is called the fuselage.
The main body of an aircraft is called the fusalage
The most common metal in aircraft is aluminium. However there is also steel , copper and sometimes gold in varying amounts.
the metal used in building most planes is alumiun as this type of metal as it can expand as the pressure in side the aircraft is greater than the pressure outside the aircraft. it is also the lightest suitable metal although boeing's 787 has been constucted with acompisite material.
You probably mean "wide body aircraft". See Wikipedia. [tty]